| 摘要 |
<p>PURPOSE:A vinyl chloride resin suitable as a binder for a magnetic recording medium, comprising a specified vinyl chloride copolymer having strong acid groups and hydroxyl groups. CONSTITUTION:A resin for a magnetic paint prepared by radical-copolymerizing vinyl chloride with a monomer having a sulfur- or phosphorus-containing strong acid group (e.g., 2-acrylamido-2-methylpropanesulfonic acid or 2-ethyl phosphato acrylate), a monomer having an -X-OH group (wherein X is an organic residue), e.g., 2-hydroxypropyl acrylate and, optionally, other monomers (e.g., vinyl acetate), vinyl chloride content >=60wt%, content of the above strong acid groups, of 0.1-4wt%, content of OH groups originated in -X-OH groups, of about 0.1-2wt%, and average degree of polymerization of about 100-900. A magnetic paint prepared by using the above resin as a binder can form a magnetic paint film excellent in surface smoothness, durability, electromagnetic characteristics, etc.</p> |
